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Diagrams and Circuit Board Illustrations
Symbols
Component Values
TM 502A Instruction Manual
This section contains the, block diagrams, circuit board illustrations, compo-
nent locator tables, and schematic diagrams for the TM502A .
Graphic symbols and class designation letters are based on ANSI Standard
Y32.2-1975. Abbreviations are based on ANSI Y1 .1-1972 .
Logic symbology is based on ANSI/IEEE Standard 91-1984 in terms of
positive logic. Logic symbols depict the logic function performed and can
differ from the manufacturer's data.
The tilde ( ~) preceding a signal name indicates that the signal performs its
intended function when in the low state .
Other standards used in the preparation of diagrams by Tektronix, Inc.,
include the following:
• Tektronix Standard 062-2476 Symbols and Practices for Schematic
Drafting
• ANSI Y14.159-1971 Interconnection Diagrams
• ANSI Y32.16-1975 Reference Designations for Electronic Equipment
• MIL-HDBK-63038-1A Military Standard Technical Manual Writing Hand-
book
Electrical components shown on the diagrams are in the following units
unless noted otherwise:
Capacitors:
Resistors:
Values one or greater are in picofarads (pF). Values less
than one are in microfarads (µF) .
Values are in Ohms (Q).
6-1
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